What Causes Tire Cupping on the Inside Tire of a Dual Wheel Setup

Question

Question:

I have a 40’ PJ trailer dual axel and dual wheels. I have only 1 tire, back axel passenger side inner tire that is cupping and scalloping horriblly and it’s the only tire doing so. Could it be bearings? Suspension? Alignment? The tire in front of it outer tire isn’t damaged like the inner tire. What can it be?

asked by: Gomez

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Expert Reply:

There could be several different causes for the tire cupping. Since it is only happening on the inner tire of your dual tire setup, have you checked the air pressure in the tire? If the air pressure is different between the two tires this could very likely be the cause of your cupping problem which means the tire is bouncing. The tires will need to be filled to the max psi listed on the sidewall.

If you have checked the air pressure then another potential cause is the balance of the wheel/tire. If the wheel/tire is out of balance more so than normal as trailers typically have a higher tolerance for out of balance wheels/tires then this could also be a cause of the tire cupping issue you are having.

The other potential cause is a worn out suspension. If the leaf springs, shackle straps, or equalizers look worn or damaged then they will need to be replaced. Let me know what you come back with and if there are any parts you need to help correct the issue. You may also want to take the trailer to a specialty shop to see if they can check the alignment of the axles for you.

expert reply by: Conner L

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Answer 1

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 2

Even though I cannot comment specifically on the grease you used because I am not familiar with it, I can tell you the best grease for trailer bearings is a a grease with a rating of GC-LB, which just means it is made to withstand very high…

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Answer 3

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 4

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 5

The three most common lug stud sizes for a trailer are 1/2"-20, 9/16"-18, and 5/8"-18. In order to make sure you get the correct lug nuts you need to measure the lug studs on the trailer now as we have no way to look this up for…

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Answer 6

The difference between an load range C and load range D tire in the same size is the capacity and psi rating. The two tires will still have the same dimensions and fit on the same wheel. The D rated tire has a higher capacity. For a ST175/80D13 like…

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Answer 7

Since both a ST145/R12 size tire, like the Kenda Karrier S-Trail #AM10130, and a 5.30-12 size tire, like the Kenda K353 #AM10068, fit a 12 inch wheel, a ST145/R12 size tire can replace a 5.30-12 size tire. Keep in mind that these tires do have…

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Answer 8

The 5.30-12 tires, being wider, are going to make more contact with the road. This means that the noise, and heat build up will be higher than a 4.80-12 tire but the rolling resistance will actually be less because the tire is larger diameter. The…

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Answer 9

The two sizes you mentioned are pretty similar and fit many of the same 15 inch wheels. The 205/75-15 fits rim widths of 5 inch to 6-1/2 inch whereas the 225/75-15 fits widths that are 5 inch to 6 inch. The 205 is 27.1 inches tall and the 225 is 28.4…

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Answer 10

Load range B trailer tires are going to have a lower capacity than C load range tires. Basically that, psi rating, and the ply rating are the only differences. A higher load range tire would last a little longer than lower load ranges of the same…

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Answer 11

Hi Hayden; that bolt pattern is really uncommon but I believe it can be found on some really old Airstream trailers. There are no modern replacements that will match. The best option is to replace the hub with one that has a common bolt pattern like…

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Answer 12

Trailer wheel bearings are specific to the spindle that is installed on the axle that is on your trailer. You will need to safely support the trailer, remove the wheel and tire, remove the grease cap, remove the cotter pin and washer that secures the…

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What Causes Tire Cupping on the Inside Tire of a Dual Wheel Setup

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